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class Message
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    public native int writeMessage(int type, char page_num, String content);">
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    public native int writeMessage(int type, char page_num, String content);">
  
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      jni on linux
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        <h4 id="1-create-Message-java-define-native-function-and-load-library"><a href="#1-create-Message-java-define-native-function-and-load-library" class="headerlink" title="1. create Message.java, define native function and load library"></a>1. create Message.java, define native function and load library</h4><pre><code>[dennis@localhost jni]$ cat Message.java
class Message
{ 
    public native int writeMessage(int type, char page_num, String content); 
    public native int getCPUTemperature(); 
    public native int getHDDTemperature(); 

    static 
    { 
        System.loadLibrary(&quot;Message&quot;); 
    }  
}
</code></pre><h4 id="2-run-‘javac-Message-java’-to-generate-Message-class"><a href="#2-run-‘javac-Message-java’-to-generate-Message-class" class="headerlink" title="2. run ‘javac Message.java’ to generate Message.class"></a>2. run ‘javac Message.java’ to generate Message.class</h4><pre><code>[dennis@localhost jni]$ javac Message.java 
</code></pre><h4 id="3-run-‘javah-Message’-to-generate-Message-h"><a href="#3-run-‘javah-Message’-to-generate-Message-h" class="headerlink" title="3. run ‘javah Message’ to generate Message.h"></a>3. run ‘javah Message’ to generate Message.h</h4><pre><code>[dennis@localhost jni]$ javah Message
[dennis@localhost jni]$ cat Message.h
/* DO NOT EDIT THIS FILE - it is machine generated */
#include &lt;jni.h&gt;
/* Header for class Message */

#ifndef _Included_Message
#define _Included_Message
#ifdef __cplusplus
extern &quot;C&quot; {
#endif
/*
 * Class:     Message
 * Method:    writeMessage
 * Signature: (ICLjava/lang/String;)I
 */
JNIEXPORT jint JNICALL Java_Message_writeMessage
  (JNIEnv *, jobject, jint, jchar, jstring);

/*
 * Class:     Message
 * Method:    getCPUTemperature
 * Signature: ()I
 */
JNIEXPORT jint JNICALL Java_Message_getCPUTemperature
  (JNIEnv *, jobject);

/*
 * Class:     Message
 * Method:    getHDDTemperature
 * Signature: ()I
 */
JNIEXPORT jint JNICALL Java_Message_getHDDTemperature
  (JNIEnv *, jobject);

#ifdef __cplusplus
}
#endif
#endif
</code></pre><h4 id="4-create-Message-c-and-implement-function"><a href="#4-create-Message-c-and-implement-function" class="headerlink" title="4. create Message.c, and implement function"></a>4. create Message.c, and implement function</h4><pre><code>[dennis@localhost jni]$ cat Message.c
#include &lt;jni.h&gt;
#include &lt;stdio.h&gt;
#include &quot;Message.h&quot;

int iCpu;
int iHdd;
int iMainboard;
int iFan;

void ReadTemperatureIni()
{
    iCpu = 37;
    iHdd = 28;
    iMainboard = 30;
    iFan = 3200;
    printf(&quot;call %s %s %d\n&quot;, __FILE__, __func__, __LINE__);
}

void send_msg(const short code, const char page, const char *content) 
{
    printf(&quot;code=%d, page=%d, content=%s\n&quot;, code, page, content);
    printf(&quot;call %s %s %d\n&quot;, __FILE__, __func__, __LINE__);
}

JNIEXPORT jint JNICALL Java_Message_getCPUTemperature(JNIEnv *env, jobject obj)
{
    ReadTemperatureIni();
    return iCpu;
}

JNIEXPORT jint JNICALL Java_Message_getHDDTemperature(JNIEnv *env, jobject obj)
{
    ReadTemperatureIni();
    return iHdd;
}

JNIEXPORT jint JNICALL Java_Message_getMainboardTemperature (JNIEnv *env, jobject obj)
{
    ReadTemperatureIni();
    return iMainboard;    
}

JNIEXPORT jint JNICALL Java_Message_getCPUFanSpeed (JNIEnv *env, jobject obj)
{
    ReadTemperatureIni();
    return iFan;
}


JNIEXPORT jint JNICALL Java_Message_writeMessage 
(JNIEnv *env, jobject obj, jint type, jchar page_num, jstring content)
{
    /* c   code use: (*env)-&gt; */
    /* c++ code use: env-&gt;    */
    const jbyte *str = (const jbyte *)(*env)-&gt;GetStringUTFChars(env,content,JNI_FALSE);
    send_msg(type, page_num, (const char*)str);
    (*env)-&gt;ReleaseStringUTFChars(env,content,(const char *)str);

    return 0;
}
</code></pre><h4 id="5-start-to-compile-file-to-dynamic-library-then-copy-the-so-file-to-usr-lib64"><a href="#5-start-to-compile-file-to-dynamic-library-then-copy-the-so-file-to-usr-lib64" class="headerlink" title="5. start to compile file to dynamic library, then copy the *.so file to /usr/lib64/"></a>5. start to compile file to dynamic library, then copy the *.so file to /usr/lib64/</h4><pre><code>[dennis@localhost jni]$ cat Makefile 
CC = gcc 
CFLAGS = -Wall -shared -fPIC
# change the directory for YOUR OS
JAVA_INC = -I/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.60-2.5.0.1.fc20.x86_64/include/  \
           -I/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.60-2.5.0.1.fc20.x86_64/include/linux 
TARGET = libMessage.so

all:$(TARGET)

libMessage.so: Message.c
    $(CC) $(CFLAGS) $(JAVA_INC) -o $@ $^

.PHONY:clean
clean:
    rm -f *.class $(TARGET)
[dennis@localhost jni]$ make
gcc  -Wall -shared -fPIC -I/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.60-2.5.0.1.fc20.x86_64/include/ -I/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.60-2.5.0.1.fc20.x86_64/include/linux  -o libMessage.so Message.c
[dennis@localhost jni]$ su -c &apos;cp libMessage.so /usr/lib64&apos;
</code></pre><h4 id="6-create-Test-java-a-sample-code-to-test-interface-function"><a href="#6-create-Test-java-a-sample-code-to-test-interface-function" class="headerlink" title="6. create Test.java, a sample code to test interface function"></a>6. create Test.java, a sample code to test interface function</h4><pre><code>[dennis@localhost jni]$ cat Test.java 
public class Test
{
     public static void main(String argv[])
     {
         new Test();
     }

     public Test()
     {
         char type = 0x1F;
         char page = 1;
         String content = &quot;Test Message&quot;;
         int ret = new Message().writeMessage(type, page, content); 

         int cpu=new Message().getCPUTemperature();
         System.out.println(cpu);     

         int hdd=new Message().getHDDTemperature();
         System.out.println(hdd);
     }
}
</code></pre><h4 id="7-run-‘javac-Test-java’"><a href="#7-run-‘javac-Test-java’" class="headerlink" title="7. run ‘javac Test.java’"></a>7. run ‘javac Test.java’</h4><pre><code>[dennis@localhost jni]$ javac Test.java    
</code></pre><h4 id="8-run-‘java-Test’"><a href="#8-run-‘java-Test’" class="headerlink" title="8. run ‘java Test’"></a>8. run ‘java Test’</h4><pre><code>[dennis@localhost jni]$ java Test 
code=31, page=1, content=Test Message
call Message.c send_msg 22
call Message.c ReadTemperatureIni 16
37
call Message.c ReadTemperatureIni 16
28
</code></pre><h4 id="A-full-version-Makefile-support-compile-java-code"><a href="#A-full-version-Makefile-support-compile-java-code" class="headerlink" title="A full version Makefile, support compile java code"></a>A full version Makefile, support compile java code</h4><pre><code>#################################################################
# Makefile 
# For JNI project on Fedora x86_64 release 20
# Create by Dennis
# 2014-07-18
#
# HOW TO MAKE A JNI PROJECT
# 1. create Message.java, define native function and load library
# 2. run &apos;javac Message.java&apos; to generate Message.class
# 3. run &apos;javah Message&apos; to generate Message.h
# 4. create Message.c, and implement function
# 5. start to compile file to dynamic library, then copy the *.so 
#    file to /usr/lib64/
# 6. create Test.java, a sample code to test interface function
# 7. run &apos;javac Test.java&apos; to generate Test.class
# 7. run &apos;java Test&apos; 
#################################################################
CC = gcc 
JAVAC = javac
CFLAGS = -Wall -shared -fPIC
# change the directory for YOUR OS
JAVA_INC = -I/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.60-2.5.0.1.fc20.x86_64/include/  \
           -I/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.60-2.5.0.1.fc20.x86_64/include/linux 
TARGET = libMessage.so Test.class

all:$(TARGET)

libMessage.so: Message.c
    $(CC) $(CFLAGS) $(JAVA_INC) -o $@ $^

Test.class: 
    $(JAVAC) Test.java    

.PHONY:clean
clean:
    rm -f *.class $(TARGET)
</code></pre><h4 id="Reference"><a href="#Reference" class="headerlink" title="Reference"></a>Reference</h4><ul>
<li><a href="http://www.cnblogs.com/bastard/archive/2012/05/17/2506877.html" target="_blank" rel="external">Linux下 JNI的使用</a></li>
</ul>

      
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